A coroner recorded an open verdict after determining ‘no reason as to why Bethany did what she did’

Ben told police they would regularly squabble about “silly little things” and said the row that morning had been a 4 on a scale of 10.

He said: “I knew she had written something but I was not aware of what she had written.

“She often used to scribble things on her arm, like pictures or notes.”

Mrs Fitton said in a statement read to the court that she had walked their family dogs with Bethany the previous evening and her daughter was happy, doing cartwheels, hand stands and the crab as they chatted.

They had talked about how Bethany now spent more time in her room than she used to, and she’d answered: “Mum, I’m a teenager.”

She described Bethany as a “reliable and capable” girl with a lot of common sense.

Richard Fitton said his daughter had loved pony riding as a youngster still slept with a comfort blanket despite beginning to fuss over hair and make-up like any normal teenage girl.

Mr Fitton said: “I cannot understand why Beth has done this. This is the last thing I ever expected to happen – it was out of the blue.”

Bethany’s school record showed she was “good” and “outstanding” in many subjects.

Her GP uncle Dr Wadsworth told the inquest she was making that difficult transition between being a child and being an adult.

Paediatric pathologist Dr Marta Cohen carried out a post mortem and found Bethany suffered a heart attack due to hanging causing hypoxia to the brain.

Assistant Coroner Peter Merchant said that although Bethany had hanged herself, she left no suicide note and he could not be satisfied she intended to take her own life.

He said that despite that morning’s argument and the message on her arm, Bethany and Ben were normal siblings.

Mr Merchant said: “There is simply no explanation given to why Bethany would do what she did on that day.”

The coroner recorded an open verdict.

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